Analyzing and improving multi-scale retinex
Kobus Barnard and Brian Funt, "Analyzing and improving multi-scale retinex,"
IS&T/SID Fifth Color Imaging Conference: Color Science, Systems and
Applications, Scottsdale, Arizona, November 1997.
The main thrust of this paper is to modify the multi-scale retinex (MSR)
approach to image enhancement so that the processing is more justified
from a theoretical standpoint. This leads to a new algorithm with fewer
arbitrary parameters that is more flexible, maintains color fidelity, and
still preserves the contrast-enhancement benefits of the original MSR method.
To accomplish this we identify the explicit and implicit processing goals
of MSR. By decoupling the MSR operations from one another, we build an
algorithm composed of independent steps that separates out the issues of
gamma adjustment, color balance, dynamic range compression, and color enhancement,
which are all jumbled together in the original MSR method. We then extend
MSR with color constancy and chromaticity-preserving contrast enhancement.
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Keywords: colour, colour constancy, dynamic range compression, Retinex,
Multi-Scale Retinex, MSR
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